ALT+TAB occasionally shows duplicate thumbnail, switches presentation mode

[Per Ångström]

Binary package hint: compiz

Occasionally when I press ALT+TAB I see one of the window thumbnails being shown twice. That is, if I have two windows open, I will see tree thumbnails instead of two, one of them being a duplicate. When this happens, it coincides with the view being different; normally the thumbnails are simply shown side-by side, but when I get the error I will see a view where the off-center thumbnails are shown with a three-dimensional effect (it's difficult to describe, but I suppose it's one of the alternative views I could choose if I changed my options).

This looks to be a mere presentation glitch, as task switching works fine. However, it is confusing.

I can reproduce this about once per login session. I have not found any usage pattern to reproduce it.

ProblemType: Bug
Architecture: amd64
CompizPlugins: [core,ccp,move,resize,place,decoration,dbus,mousepoll,gnomecompat,png,svg,imgjpeg,text,commands,neg,wall,snap,animation,scale,scaleaddon,expo,staticswitcher,regex,resizeinfo,workarounds,ezoom,vpswitch,fade,session,shift,wobbly]
Date: Wed Dec 16 11:05:08 2009
DistroRelease: Ubuntu 10.04
Lsusb:
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Hewlett-Packard HP Compaq nx7400 (RH399EA#AK8)
Package: compiz 1:0.8.4-0ubuntu9
PackageArchitecture: all
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
PciDisplay: 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
ProcCmdLine: root=UUID=874c2412-ab15-45eb-b240-faf9953ffff6 ro quiet splash
ProcVersionSignature: Ubuntu 2.6.32-8.12-generic
RelatedPackageVersions:
 xserver-xorg 1:7.5~3ubuntu4
 libgl1-mesa-glx 7.6.1~rc3-1ubuntu1
 libdrm2 2.4.14-1ubuntu2
 xserver-xorg-video-intel 2:2.9.1-1ubuntu1
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu2
SourcePackage: compiz
Tags: lucid
Uname: Linux 2.6.32-8-generic x86_64
dmi.bios.date: 10/23/2006
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68YGU Ver. F.08
dmi.board.name: 30A2
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 40.17
dmi.chassis.asset.tag: CNU6390SK0
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68YGUVer.F.08:bd10/23/2006:svnHewlett-Packard:pnHPCompaqnx7400(RH399EA#AK8):pvrF.08:rvnHewlett-Packard:rn30A2:rvrKBCVersion40.17:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq nx7400 (RH399EA#AK8)
dmi.product.version: F.08
dmi.sys.vendor: Hewlett-Packard
system: distro = Ubuntu, architecture = x86_64, kernel = 2.6.32-8-generic

[Per Ångström (autark)]

I haven't seen this in a long time. I wish Launchpad had a WORKSFORME status.